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【单选题】
According to paragraph 1, why is it impossible to identify the time period for theatres in Greece?A.
There are too few sites that have been excavated and very little data collected about them.
B.
The archeologists from earlier periods were not careful, and many artifacts were broken.
C.
It is confusing because stones from early sites were used to build later structures.
D.
Because it is very difficult to date the concrete that was used in construction during early periods.
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【简答题】设变量x，y满足约束条件 则z=3x﹣2y的最大值为（ ）．
【单选题】负债率是指一定时期一国的外债余额与当期的国内生产总值之比。它用来衡量一国对外债的依赖程度，并从整体上体现该国的债务风险，其参考标准是（），超过这个数字就有可能对外债过分依赖，当金融市场或国内经济发生动荡时，容易出现偿债困难。
A.
5％
B.
10％
C.
15％
D.
20％
【简答题】Java语言中，事先定义好并赋予了特殊含义的单词，被称为【】
【单选题】求过点 (1, 1, 1) 且与平面 Π 1 : x − y + z = 7 和 Π 2 : 3x + 2y − 12z + 5 = 0 垂直的平面方 程.
A.
3x + 3y + z = 6.
B.
2x + 3y + z = 6.
C.
2x + 3y + 2z = 5.
D.
x + 3y + z = 6.
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